"Aamir can speak."

Translation: आमिर बोल सकता है।

[AbuZubair2]

Aamir "bol sakte hain" is also correct, its like giving respect to him, just like "vous" and "tu" in french

[vinay92]

Yes, you are right. When using the respectful form, you often also add the suffix 'ji' to the name - "Aamirji bol sakte hain' but it is not wrong even without the 'ji'.